<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app" v-bind:class="{ active: isActive }">我是传奇</div>
  </body>
</html>
<script src="../js/vue.js"></script>

<script>
  var app = new Vue({
    el: "#app",
    data: {
      isActive: true,
    }
  });
</script>
